VIANC/pw_plugin_II/aec.h

#pragma once

#include "fdaf.h"
#include <array>

class AEC {
public:
	void do_sample(float mic, float hp, bool maybevoice);

	void do_buffer(float* res, float* mic, float* hp, bool maybevoice);

	bool  inject_noise();

	std::array<float, 8192> lookback;
	int lb_index;

	/*
		 By chunks of 8 samples
		 We expect to have >= 1024 samples delay, or 128 chunks delay.
	*/
	std::array<float, 512> lookback_power;
	float mic_acc = 0.0f;
	float hp_acc = 0.0f; 
	int lookback_phase = 0;

	std::array<float, 512> weighted_xcorr;
	static constexpr float xcorr_decay = (1.0f)/(48000/8); // 100ms 

	int current_delay = 0; // We expect sudden drifts

	enum {LOST, LEARNING, ONLINE} status = LOST; 
	int cnt = 0;

	FDAF fd = FDAF(1024);

private:
	void find_delay(float mic, float hp);
};